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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ARM64] Cortex-a53 schedule mode can't handle NEON post-increment load"
href="http://llvm.org/bugs/show_bug.cgi?id=19761">19761</a>
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<th>Summary</th>
<td>[ARM64] Cortex-a53 schedule mode can't handle NEON post-increment load
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>Hao.Liu@arm.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>For the following test case:
-------------------------------------------------------------------------------
define { <16 x i8>, <16 x i8> } @test_v16i8_post_imm_ld2(i8* %A, i8** %ptr) {
;CHECK-LABEL: test_v16i8_post_imm_ld2:
;CHECK: ld2.16b { v0, v1 }, [x0], #32
%ld2 = tail call { <16 x i8>, <16 x i8> } @llvm.arm64.neon.ld2.v16i8.p0i8(i8*
%A)
%tmp = getelementptr i8* %A, i32 32
store i8* %tmp, i8** %ptr
ret { <16 x i8>, <16 x i8> } %ld2
}
declare { <16 x i8>, <16 x i8> } @llvm.arm64.neon.ld2.v16i8.p0i8(i8*)
-------------------------------------------------------------------------------
Run with -mcpu=cortex-a53 will result as following:
$ llc -march=arm64 -mcpu=cortex-a53 < ld2.ll
.text
.file "<stdin>"
LLVM ERROR: DefIdx 1 exceeds machine model writes for %vreg2<def,tied2>,
%vreg3<def> = LD2Twov16b_POST %vreg2<tied0>, %XZR; GPR64common:%vreg2 QQ:%vreg3
It seems that there is something wrong within ARM64SchedA53.td.</pre>
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